Fix linearelastic

[adtzlr]

see #59

[codecov-commenter]

Codecov Report

Merging #60 (4a2b8e6) into main (199f9e1) will decrease coverage by 0.01%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   89.90%   89.88%   -0.02%     
==========================================
  Files          19       19              
  Lines        2140     2146       +6     
==========================================
+ Hits         1924     1929       +5     
- Misses        216      217       +1     

Impacted Files	Coverage Δ
felupe/constitution/models.py	98.30% <83.33%> (-1.70%)	⬇️
felupe/tools.py	78.80% <100.00%> (+0.28%)	⬆️

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[adtzlr]

fixes #60